from itsdangerous import TimedJSONWebSignatureSerializer as TJSSerializer, BadDatafrom django.conf import settingsdef generate_save_user_token(openid):    """对openid进行加密"""    # 1.创建序列化器    serializer = TJSSerializer(settings.SECRET_KEY, 600)    # 2.包装要加密的数据    data = {        'openid': openid    }    # 3.dumps进行加密(返回默认是bytes类型)    access_token_bytes = serializer.dumps(data)    # 4.返回    return access_token_bytes.decode()def check_save_user_token(access_token):    """解密"""    # 1.创建序列化器    serializer = TJSSerializer(settings.SECRET_KEY, 600)    # 2.反序列化解密    try:        data = serializer.loads(access_token)    except BadData:        return None    else:        return data.get('openid')